Thyristor resistance-capacitance protection circuit b

Diodes and thyristors have poor ability to withstand overcurrent and overvoltage . Short-term overvoltage and overcurrent will damage components, but the device cannot be determined
entirely based on the temporary overcurrent and overvoltage values ​​that may occur when the device is running. parameters, but also to give full play to
the overload capability of the device. Therefore, protection has become an indispensable and important link to improve the operational reliability of the thyristor
device.   By connecting a resistor and a capacitor in parallel on the secondary side of the transformer, as shown in the figure, the electromagnetic energy released from the transformer winding can be converted into
the electric field energy of the capacitor C and stored. Since the voltage across the capacitor cannot change suddenly, overvoltage can be effectively suppressed. The series resistor can dissipate part of the energy
generated by the overvoltage and suppress the oscillation of the LC loop.